At first I thought it was a satelite in a North-South orbit. It grew brighter and seemed to change course slightly.

One clear Sunday evening I was in our backyard looking at the stars. I noticed a light moving through the sky just above constellation Orion. I thought it was a satelite in orbit moving North and slightly West. While I watched it suddenly grew brighter and it's trajectory seemed to swing slightly more to the West. I lost sight of it when it went behind some trees. I moved about 200 feet North to the other side of the copse of trees but could not find it again.